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pip 安装jupyter_contrib_nbextensions, jupyter_nbextensions_configurator

安装完之后分别执行

jupyter contrib nbextension install --user
jupyter nbextensions_configurator enable --user

然后打开一个notebook，在edit菜单下配置nbextensions

参考：

https://stackoverflow.com/questions/33159518/collapse-cell-in-jupyter-notebook?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

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